I've actually done business with them. The book they're selling actually exist. I got a stack from them, but I also know someone who worked there. It's basically a scam, in short..

Called today looking for $240 for me to advertize in a so-called children's book. Refused my request for more info by email. Caller disconnected when I stated I could not support this request without more information.

weird number... always calls, no messages or just random background noise